Finally figured it out, all I had to do was use the Round function on both components of f and it works perfectly. Have to admit I did it more out of desperation than anything i wasn't expecting that to work

nvm

From your description, I assume your f table looks something like this:

{1, 1, -1, 1, -1, -1, 1, -1}

If I use DeleteElements[] on it as follows, I get the desired result:

DeleteElements[{1, 1, -1, 1, -1, -1, 1, -1}, {-1}]
(*  {1, 1, 1, 1} *)

It looks like your DeleteElements[] code does not end in {-1}]. Rather, you seem to have put the {-1}] in the middle of the Table[] code. This is probably the problem, unless there is a problem with f or e, which you did not show.